Hi,
Note: I consider "theengineeringprojects" rather as a commercial site that an good place for information.
To your topic:
Panelisation is good for small PCBs. You don´t have to handle each small PCB by PCB, but you have many PCBs on one panel. This is a benefit in time and reduced errors for
* PCB production
* stock
* when applying solder paste
* (SMD) assembling
* soldering
* testing
Thus
* solder paste stencil needs to be manufactured for panelisation
* data for the assembling machine needs to be generated for the panelisation
So you can do the panelisation on your own (copy & paste on the EDA). Then you have all parameters in your hand.
Or you may have the PCB house make the panelisation. Then they should also produce the according solder paste stencils and they need to provide you the exact X and Y offsets to generate the assembling data.
Some PCB manufacturers provide an online tool to design the panelisation. This is what I prefer.
Thus you have the parameters in your hand but still you have a "single board" in your EDA, which makes redesigns more easy.
I guess every designer has his own preferences and also the application has it´s requirements.
Somehow you have to find your own way.
Klaus